%0 Journal Article
%A LIU Zhi chao
%A Luo qiang
%A RONG Ji li
%A WU Yue min
%A WU Zhi pei
%A Xin Peng fei
%T
Modal Simulation and Experimental Research on Circular
Solar Arrays
%D 2020
%R 10.3873/j.issn.1000-1328.2020.12.005
%J Journal of Astronautics
%P 1516-1524
%V 41
%N 12
%X The modal simulation analysis of circular solar arrays
is implemented by using the finite element software SAMCEF. The influences of
the wing preload, constraints and suspension spring gravity unloading system on
the modes of the circular solar arrays are studied. The results show that the
wing preload affects the mode of the solar arrays greatly; the constraints of
the support structure slightly affects the first order
mode of the solar arrays; the difference between the first order modal frequencies of the solar arrays with and without support
structure can reach 32.89%, so the support structure cannot be applied in the
ground test; the suspension spring gravity unloading system can effectively
reduce the effect of gravity on the mode; in addition, when the spring
stiffness is less than 7 N/m, its effect on the mode of the solar arrays is
less than 0.59‰. Subsequently, the operational modal
analysis techniques and two point excitation method are
employed during the test. The testing program is optimized through the pilot
tests. The first four vibration modes and natural frequencies of the circular
solar arrays are measured by using the sine sweep technique. Finally, through
the finite element model modification technique, the error of the modal
simulation results is kept within 4.16%, which meets the requirements of
relevant test standards.
%U http://www.yhxb.org.cn/EN/10.3873/j.issn.1000-1328.2020.12.005